TY - JOUR
T1 - Quantum discord and non-Markovianity of quantum dynamics
AU - Alipour, S.
AU - Mani, A.
AU - Rezakhani, A. T.
PY - 2012/5/10
Y1 - 2012/5/10
N2 - The problem of recognizing (non-)Markovianity of a quantum dynamics is revisited through analyzing quantum correlations. We argue that instantaneouslyvanishing quantum discord provides a necessary and sufficient condition for Markovianity of a quantum map. This is used to introduce a measure of non-Markovianity. This measure, however, requires demanding knowledge about the system and the environment. By using a quantum correlation monogamy property and an ancillary system, we propose a simplified measure with fewer requirements. Non-Markovianity is thereby decided by quantum state tomography of the system and the ancilla.
AB - The problem of recognizing (non-)Markovianity of a quantum dynamics is revisited through analyzing quantum correlations. We argue that instantaneouslyvanishing quantum discord provides a necessary and sufficient condition for Markovianity of a quantum map. This is used to introduce a measure of non-Markovianity. This measure, however, requires demanding knowledge about the system and the environment. By using a quantum correlation monogamy property and an ancillary system, we propose a simplified measure with fewer requirements. Non-Markovianity is thereby decided by quantum state tomography of the system and the ancilla.
UR - http://www.scopus.com/inward/record.url?scp=84861079771&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.85.052108
DO - 10.1103/PhysRevA.85.052108
M3 - Article
AN - SCOPUS:84861079771
SN - 1050-2947
VL - 85
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 5
M1 - 052108
ER -